Meanwhile, make the frosting. Beat butter with a hand mixer until the butter is light and fluffy. Then add the melted Cookies ‘n’ Creme bars. Gradually mix in powdered sugar, then add milk and vanilla and beat until smooth.

Top one round cake with frosting, then place the second cake on top of it. Frost the top and sides of the cake. Line the sides of the cake with Oreos to decorate. Top with crushed Oreos and garnish with mini Oreos.

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